C:/Private/OSS/n2cms/github/n2cms/src/Framework/Extensions/Linq/EngineExtensions.cs

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using System.Linq;
using N2.Engine;
using N2.Persistence.NH;
using N2.Details;
using NHibernate.Linq;
using N2.Persistence.Finder;

namespace N2.Linq
{
        public static class EngineExtensions
        {
                public static IQueryable<T> Query<T>(this IEngine engine)
                {
            var q = engine.Resolve<ISessionProvider>().OpenSession.Session.Query<T>();
                        if(typeof(ContentItem).IsAssignableFrom(typeof(T)))
                                return new ContentQueryable<T>(q);
            return q;
                }

        public static IQueryable<T> QueryItems<T>(this IEngine engine) where T : ContentItem
                {
            return engine.QueryItems<T>(VersionOption.Exclude);
        }

        public static IQueryable<T> QueryItems<T>(this IEngine engine, VersionOption versions) where T : ContentItem
        {
            var q = engine.Query<T>();
            if (versions == N2.Persistence.Finder.VersionOption.Exclude)
                q = q.Where(i => i.VersionOf == null);
            return q;
        }

        public static IQueryable<ContentItem> QueryItems(this IEngine engine)
                {
            return engine.QueryItems<ContentItem>(VersionOption.Exclude);
        }

        public static IQueryable<ContentItem> QueryItems(this IEngine engine, VersionOption versions)
        {
            return engine.QueryItems<ContentItem>(versions);
        }

        public static IQueryable<T> QueryDetails<T>(this IEngine engine) where T : ContentDetail
                {
                        return engine.Query<T>();
                }

        public static IQueryable<DetailCollection> QueryDetailCollections(this IEngine engine)
                {
                        return engine.Query<DetailCollection>();
                }
        }
}